Outturned-edge can closure



f i o 1&2 Apr; 7 F. J. oamEN UUTTUHNBD EDGE CAN cLosURE Filed Feb. l2. 1925 (/e a E .10 ing ot' Patented Apr. 5, 1927.

UNITED 'STATES PATENT OFFICE.

FRANK J'. OBRIEN, OF BALTIMORE, MARYLAND, ASSIGNOR 'EO SOUTHERN CAN COM- PANY, OF BALTIMORE, MARYLAND, A CORPORATION F MARYLAND.

OUTTURNED-EDGE CAN CLOSURE.

Application mea Februarym, 1923. serian No. 618,663.

rlhis invention relates to can clos'uresand has l'or its object the irovision ot a container ot' the friction closure type wherein the container is sealed at, the timeI the can is made and the cover so formed that when the seal is brokenand the contents of the can partly used the cover may be replaced on the can and the l'ric'tion closure will t'orln an etlective seal. the improvements consistcertain changes in configuration whereby the sealing ot the can is facilitated and the strength oli' the container as a whole increased.

A further object ot the present invention r consists in providingl a can and cover otI the `friction closuretype in which cach member is provided with a` rigid, closed. rolled edge.

A still further object of the present. invention is the provision of a shoulder on the can bod)7 to t'orni an annular stop t'or prevventing movtment otl the gasket away Jfrom the cover during the sealing operation. Y

In the latest and mostl improved types of friction closures for sanitary cans the cover edge is rolled down and toward the cylindrical surface ot' the can so as to bind the gasket between the cover flange and the can body, this operation flaring the edge ot' the can outwardl) and forming a rather sharp edge. In these types the rim of the finished sealed cover is sometimes rolled to form a rigid edge or head, the peripheral portion ot the end-or cover heing outturned at the close ot' the .sealing operation.

lonsiderable ditlicult \v has been encountered in the sealing ot such cans due to the tendency otl the gasket ring to creep downward a\'a`v 't'rom the mouth otl the can when the cover is subjected to, radial pres 4.0 sure in tbc rolling operation which obviousl)` decreasesl the diameter ol' the gasket ring.

lt thus occurs that the. gasket bows downward in advance, otE the spinning rollers at timesl to such an extent as to t'orm an imperfect seal.

(lne ot' the objects of the present invention, as previousl)v stated, is to prevent this creeping down "ard ot' the gasket. this purpose being accomplished by providing'an annular bulge or ridge which 'forms an annular shoulder or stop portion which guides the gasket land overcomes t0 a ,very large measure the bowing ot' the. gasket. away`` from the cover and mouth of the can.

In the drawings, 55

Figure 1 is a vertical section through a. portion of the can showing the part-s as they appear a'tter the first' Spinning rollerl has completed its c vcle. ot movement.

Fig. 2 is a similar view, but showing the 60 closure in its tinished state after the second spinning roller has formed the closed bead or rolled edge on the cover.

In the usual method of nia-king cans parr ticularly those of the sanitary type having ren'iovable covers the removable corel is applied in the can factory and is sealed on one end of an open ended cylindrical body member and the permanent cover which forms the bottoni ot' the can is not applied until 70 the container is filled; the invention here'in issue therefore will be described in connection with such practice.

T he can body 10 is generallyY cylindrical but the rim ot' the mouth is outturned to 75 form a rolled edge 1l and at a distance from this rolled edge the can body is indented on the inside as at 12 producing an annular SQwell or ridge 15 on the outside ot' the can F1o that a shoulder 14 is torined by the ridge 80 15 and the cylindrical portion lt between the ridge and the rolled edge 11.

Itl is preferred that the rolled edge and the shoulder should he formed in the can hodvbefore the blank passes to the sealing sa machine but. this issnot essential. It is also preferred to apply the gast-et; 20 to the Cylindrical portion 16 ot' the lan body ratheithan to the cover 21,--l utt,his is also a matter otchoice. depending largely on ywhat style of ao gasket is used. As; shown. the gasket QO-is ot' rubber and is applied to the 'an body in an v de'ired manuel'. with or without the use of an adhesive; butv this gasket.y may be formed h v depositing a laver otI liquid ruba5 ber eon'lpofsition on the cover or on the can body.

The can body with its rolled edge and bead preformed and carrying the necessary gasket is placed on the usual spinning table `(not tao shown) and the cover is placed on the chuck 23 which in accordance with usual practice is rotated at. high speed. lVhen the spinning table moves/upwardly so as to bring the can body into irm engagement with the can cover the first spinning roller24 moves radially towards the axis of the spinning table with its axis constantly parallel to the edge of the can so that its central rounded projetion 25 comes in contact with the flange o1 the can cover and indents it as at 26, deforming add mnpressing the gasket against the outer surface of the ,container body and against both-vv Lthe rolled edge l1 and the rldge 15. ,y I

DoWnWard mdveinent of the gasket is nrevented by the shoulder d4 so that the gasket l1s comptressed so as to take up the slack,

being guided and limited by the ridge 15 and the rolled edge 11. The second spinning roller 30 rolls the edge of the cover to form a. rigid edUe or closed bead. The second spinning rolller, if desired, .may compress the gasket a slight amount further, but in praetice this has been found to be of no advantage and as illustrated the second spinning roller has no function save to form the outturnedrolled edge on the cover.

What I claim is:

A. can seam including a container having an annular indentation on the inside producing an exterior ridge forming a shoulder near the mouth of the container, an outturned stitl'ening rolled edge on the con-` 30 tainer, a gasket engaging said container be` tween the rolled edge andthe ridge, a c0vei1,' frictionally engaging the container between said rolled edge and said indentation and extending beyond the wall of the' container 35 parallel to the plane of the mouth and then turned downward to form a. channel, the outer Wall of the channel being indented to compress the gasket against the can body and a stilening rollededge on said cover.

FRANK` OBRIEN. 

